docs: def keys(self, latest=False):
          """
          Return a list of the keys in this directory.
  
          Parameters
          ----------
  
          latest : bool, optional (default=False)
              If True then return a list of keys with unique names where only the
              key with the highest cycle number is included where multiple keys
              exist with the same name.
  
          Returns
          -------
  
          keys : list
              List of keys
  
          """
          if latest:
              keys = {}
              for key in self.keys():
                  name = key.GetName()
                  if name in keys:
                      if key.GetCycle() > keys[name].GetCycle():
                          keys[name] = key
                  else:
                      keys[name] = key
              return keys.values()
          return [asrootpy(key) for key in self.GetListOfKeys()]